For what it's worth, I find that on mobile (usually Chrome on Android) every so often things get a bit confused and some or all toolbar buttons on the message composition form stop working until I manually clear Askaboutmoney cookies.
But I've also noticed that, even when this doesn't happen, some formatting options (e.g. insert pic, attach file) are not available in some forums but are in others. I'd have to check to be more specific as I can't remember the details offhand.